Comparison of surface ozone simulation among selected regional models in MICS-Asia III  – effects of chemistry and vertical transport for the causes of difference

Akimoto, Hajime; Nagashima, Tatsuya; Li, Jie; Fu, Joshua S.; Ji, Dongsheng; Tan, Jiani; Wang, Zifa

doi:10.5194/acp-19-603-2019

Cited by 26 publications

(29 citation statements)

References 47 publications

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“…O 3 concentrations slowly increased with height in M8 and M11, but they mixed well in the planetary boundary layer (PBL) and decreased from 800 to 700 hPa in the other models. Akimoto et al (2019) found that the parameterization on downward O 3 transport from the upper boundary layer contributed considerably to discrepancies between M1, M6 and M11. In EA2, vertical structures of O 3 among models were found to be consistent, but concentrations differed more than those in EA1.…”

Section: Vertical Profiles Of Omentioning

confidence: 96%

“…The EANET was launched in 1998 to address acid deposition problems in East Asia, following the model of the Cooperative Program for Monitoring and Evaluation of the Long-Range Transmission of Air Pollutants in Europe. In this study, eight remote stations in the northwestern Pacific and Japan (EA3 subregion) were selected to evaluate model performance levels for the downwind regions of the Asian continent (Ban et al, 2016). More information on the EANET can be found at http://www.eanet.asia/ (last access: 8 October 2019).…”

Section: Observational Data For Omentioning

confidence: 99%

“…Their intercepts were 74.9-121.2 ppbv, far exceeding observations (59.5 ppbv). Akimoto et al (2019) calculated the net photochemical production of M1, M6 and M11 and found that weak net chemical production in M11 was mostly responsible for low O 3 compared with those in M1 and M6. This finding is consistent with the low slope in M11.…”

Section: Relationships Between Surface No X and Omentioning

confidence: 99%

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Model evaluation and intercomparison of surface-level ozone and relevant species in East Asia in the context of MICS-Asia Phase III – Part 1: Overview

Nagashima

Kong

et al. 2019

Atmos. Chem. Phys.

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Abstract. Spatiotemporal variations of ozone (O3) and nitrogen oxide (NOx) mixing ratios from 14 state-of-the-art chemical transport models (CTMs) are intercompared and evaluated with O3 observations in East Asia, within the framework of the Model Inter-Comparison Study for Asia Phase III (MICS-Asia III). This study was designed to evaluate the capabilities and uncertainties of current CTMs simulations for Asia and to provide multi-model estimates of pollutant distributions. These models were run by 14 independent groups working in China, Japan, South Korea, the United States and other countries/regions. Compared with the previous phase of MICS-Asia (MICS-Asia II), the evaluation with observations was extended from 4 months to 1 full year across China and the western Pacific Rim. In general, model performance levels for O3 varied widely by region and season. Most models captured the key patterns of monthly and diurnal variation of surface O3 and its precursors in the North China Plain and western Pacific Rim but failed to do so for the Pearl River Delta. A significant overestimation of surface O3 was evident from May to September/October and from January to May over the North China Plain, the western Pacific Rim and the Pearl River Delta. Comparisons drawn from observations show that the considerable diversity in O3 photochemical production partly contributed to this overestimation and to high levels of inter-model variability in O3 for North China. In terms of O3 soundings, the ensemble average of models reproduced the vertical structure for the western Pacific, but overestimated O3 levels to below 800 hPa in the summer. In the industrialized Pearl River Delta, the ensemble average presented an overestimation for the lower troposphere and an underestimation for the middle troposphere. The ensemble average of 13 models for O3 did not always exhibit superior performance compared with certain individual models in contrast with its superior value for Europe. This finding suggests that the spread of ensemble-model values does not represent all of the uncertainties of O3 or that most MICS-Asia III models missed key processes. This study improved the performance of modeling O3 in March at Japanese sites compared with MICS-Asia II. However, it overpredicted surface O3 concentrations for western Japan in July, which was not found by MICS-Asia II. Major challenges still remain with regard to identifying the sources of bias in surface O3 over East Asia in CTMs.

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Section: Vertical Profiles Of Omentioning

confidence: 96%

Section: Observational Data For Omentioning

confidence: 99%

Section: Relationships Between Surface No X and Omentioning

confidence: 99%

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Model evaluation and intercomparison of surface-level ozone and relevant species in East Asia in the context of MICS-Asia Phase III – Part 1: Overview

Nagashima

Kong

et al. 2019

Atmos. Chem. Phys.

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“…where WD model is the original modeled wet deposition and P model and P observation are the modeled and observed precipitation amounts, respectively. This approach has been used in previous studies over the US (Appel et al, 2011;Zhang et al, 2018) and Asia (Itahashi, 2018). Note that this precipitationadjusted approach assumes that errors associated with the modeled precipitation are linearly related to errors in wet deposition amounts and the precipitation was adjusted by the total amount of observed precipitation; hence, the modeled convective and subgrid-scale precipitation was not distinguished.…”

Section: Precipitation-adjusted Approachmentioning

confidence: 99%

“…This phase consists of three parts: topic 1, the comparison and evaluation of current multiscale air quality models; topic 2, the development of reliable emission inventories in Asia; and topic 3, the interactions between air quality and climate change. Scientific papers focusing on gas-phase species (Kong et al, 2020), aerosols (Chen et al, 2019), and ozone (O 3 ) (Akimoto et al, 2019;Li et al, 2019) have been published. The details of topic 2 (Li et al, 2017a) and topic 3 (Gao et al, 2018) have also been reported.…”

Section: Introductionmentioning

confidence: 99%

MICS-Asia III: overview of model intercomparison and evaluation of acid deposition over Asia

Itahashi

Sato

et al. 2020

Atmos. Chem. Phys.

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Abstract. The Model Inter-Comparison Study for Asia (MICS-Asia) phase III was conducted to promote understanding of regional air quality and climate change in Asia, which have received growing attention due to the huge amount of anthropogenic emissions worldwide. This study provides an overview of acid deposition. Specifically, dry and wet deposition of the following species was analyzed: S (sulfate aerosol, sulfur dioxide (SO2), and sulfuric acid (H2SO4)), N (nitrate aerosol, nitrogen monoxide (NO), nitrogen dioxide (NO2), and nitric acid (HNO3)), and A (ammonium aerosol and ammonia (NH3)). The wet deposition simulated by a total of nine models was analyzed and evaluated using ground observation data from the Acid Deposition Monitoring Network in East Asia (EANET). In the phase III study, the number of observation sites was increased from 37 in the phase II study to 54, and southeast Asian countries were newly added. Additionally, whereas the analysis period was limited to representative months of each season in MICS-Asia phase II, the phase III study analyzed the full year of 2010. The scope of this overview mainly focuses on the annual accumulated deposition. In general, models can capture the observed wet deposition over Asia but underestimate the wet deposition of S and A, and show large differences in the wet deposition of N. Furthermore, the ratio of wet deposition to the total deposition (the sum of dry and wet deposition) was investigated in order to understand the role of important processes in the total deposition. The general dominance of wet deposition over Asia and attributions from dry deposition over land were consistently found in all models. Then, total deposition maps over 13 countries participating in EANET were produced, and the balance between deposition and anthropogenic emissions was calculated. Excesses of deposition, rather than of anthropogenic emissions, were found over Japan, northern Asia, and southeast Asia, indicating the possibility of long-range transport within and outside of Asia, as well as other emission sources. To improve the ability of models to capture the observed wet deposition, two approaches were attempted, namely, ensemble and precipitation adjustment. The ensemble approach was effective at modulating the differences in performance among models, and the precipitation-adjusted approach demonstrated that the model performance for precipitation played a key role in better simulating wet deposition. Finally, the lessons learned from the phase III study and future perspectives for phase IV are summarized.

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Improvement of the ozone forecast over Beijing through combining the chemical transport model with multiple machine learning methods

Xie,

Tang,

Zheng

et al. 2024

Atmospheric Pollution Research

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Comparison of surface ozone simulation among selected regional models in MICS-Asia III – effects of chemistry and vertical transport for the causes of difference

Cited by 26 publications

References 47 publications

Model evaluation and intercomparison of surface-level ozone and relevant species in East Asia in the context of MICS-Asia Phase III – Part 1: Overview

Model evaluation and intercomparison of surface-level ozone and relevant species in East Asia in the context of MICS-Asia Phase III – Part 1: Overview

MICS-Asia III: overview of model intercomparison and evaluation of acid deposition over Asia

Improvement of the ozone forecast over Beijing through combining the chemical transport model with multiple machine learning methods

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